Arnold made a couple of discs for Lyrita in the late 1980s/early 1990s(?) They're both reviewed on MWI: the various Dances on one (a lovely disc) and Sym 4 by itself on the other.

The Fourth Symphony which, long pre-dates his later dark period (syms 7 and 9 at the core of that period) plays for an extraordinary 54:11 in that Lyrita recording. That's very much longer than the Fourth as presented by Handley as part of the Conifer cycle: 37:24.

It seems perhaps that the more extended approach he adopted for Sym 7 at its premiere also extended to his conducting of his music from his earlier more headlong years.

By the way, those who were wondering about the later symphonies, while 7 and 9 are predominantly dark in mood, the Eighth is a brilliant contrast. A triumphant, towering and tragic piece with its Sally Army-style march tune gloriously presented; close to Mahlerian.

At least that's the way I hear it. If you are put off by 7 and 9 don't miss out on hearing 8.